25. The _______ work continued for more than a week but there was still no sign of the missing boy.
A. research B. rescue C. vessel D. vast
26. Many kinds of animals are believed to have _________ from the earth
A. withdrawn B. vanished C. found D. hung
27. The engineers in this lab spent several weeks _______ their plans for the new bicycle.
A. counting B. stripping C. elaborating D. casting
28. Pine trees are usually believed to _______ cold weather.
A. guard B. accomplish C. roar D. endure
29. Free medical service is _______ to nearly all the college students in China.
A. favorite B. available C. convenient D. average
30. After working for twenty hours without any rest, the doctors were _______.
A. exhausted B. mounted C. wrapped D. restored
参考答案:16. A 17. B 18. A 19. D 20.C 21.A 22.A 23.B 24.A 25. B 26. B 27. C 28. D 29. B 30. A
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